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1. Arduino IDE

The code below is incomplete. To get complete code, please click here.

After programming the RFID.ino, the IC card or the mobile phone NFC, close to the unit, moves back and forth around the unit, and the UID of the IC card or the RFID chip in the mobile phone will be printed on the screen of the M5Core.

#include <Wire.h>
#include "MFRC522_I2C.h"
#include <M5Stack.h>

// 0x28 is i2c address on SDA. Check your address with i2cscanner if not match.
MFRC522 mfrc522(0x28);   // Create MFRC522 instance.

// initialization
M5.begin(); Serial.begin(115200); Wire.begin();
/* Init MFRC522 */
/* Show details of PCD - MFRC522 Card Reader details */

// get the uid of available card
mfrc522.PICC_IsNewCardPresent();// scan for a new card
mfrc522.PICC_ReadCardSerial();// read data
// a new card is selected. The UID and SAK is saved at mfrc522.uid structor.
for (byte i = 0; i < mfrc522.uid.size; i++) {
  Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
  Serial.print(mfrc522.uid.uidByte[i], HEX);

// other function
void ShowReaderDetails() {
  /* Get the MFRC522 software version */
  byte v = mfrc522.PCD_ReadRegister(mfrc522.VersionReg);
  if (v == 0x91) Serial.print(F(" = v1.0"));
  else if (v == 0x92) Serial.print(F(" = v2.0"));
  else Serial.print(F(" (unknown)"));

2. UIFlow

To get complete code, please click here.

After opening and burning this example using UIFlow, place the proximity card on the Unit surface and the screen displays “True” and the UID number of the card.

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